The peculiar dipping events in the disc-bearing young-stellar object EPIC 204278916

S. Scaringi, C. F. Manara, S. A. Barenfeld, P. J. Groot, A. Isella, M. A. Kenworthy, C. Knigge, T. J. Maccarone, L. Ricci, M. Ansdell

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Abstract

EPIC 204278916 has been serendipitously discovered from its K2 light curve that displays irregular dimmings of up to 65 per cent for ≈25 consecutive days out of 78.8 d of observations. For the remaining duration of the observations, the variability is highly periodic and attributed to stellar rotation. The star is a young, low-mass (M-type) pre-main-sequence star with clear evidence of a resolved tilted disc from Atacama Large Millimeter/submillimeter Array (ALMA) observations. We examine the K2 light curve in detail and hypothesize that the irregular dimmings are caused by either a warped inner disc edge or transiting cometary-like objects in either circular or eccentric orbits. The explanations discussed here are particularly relevant for other recently discovered young objects with similar absorption dips.

Original languageEnglish
Pages (from-to)2265-2272
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume463
Issue number2
DOIs
StatePublished - Dec 1 2016

Keywords

  • Comets: general
  • Planets and satellites: dynamical evolution and stability
  • Stars: early-type
  • Stars: individual: (EPIC 204278916)
  • Stars: peculiar

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    Scaringi, S., Manara, C. F., Barenfeld, S. A., Groot, P. J., Isella, A., Kenworthy, M. A., Knigge, C., Maccarone, T. J., Ricci, L., & Ansdell, M. (2016). The peculiar dipping events in the disc-bearing young-stellar object EPIC 204278916. Monthly Notices of the Royal Astronomical Society, 463(2), 2265-2272. https://doi.org/10.1093/mnras/stw2155